From: Gerhard Sittig <redacted>
Date: Tue, 23 May 2017 17:41:41 +0000 (+0200)
Subject: options: expand builtin help, discuss samples/time/continuous constraint
X-Git-Tag: sigrok-cli-0.7.0~12
X-Git-Url: https://sigrok.org/gitaction?a=commitdiff_plain;h=65c1ecf9045a87cfd87e0c7d87bf3ca2d7e60021;p=sigrok-cli.git

options: expand builtin help, discuss samples/time/continuous constraint

It might be surprising when the sigrok-cli(1) program does nothing (yet
spends user noticable time) before quitting while it spews the --help
text to the screen. Expand the builtin help text, explicitly mention
that either of --samples or --frames or --time or --continuous are
essentially required for data acquisition.
---

diff --git a/options.c b/options.c
index 4d39847..9c8dc8c 100644
--- a/options.c
+++ b/options.c
@@ -215,4 +215,16 @@ void show_help(void)
 	g_free(help);
 
 	g_option_context_free(context);
+
+#ifdef HAVE_SRD
+#define SHOW_DECODER_TEXT "| -P <decoder> "
+#else
+#define SHOW_DECODER_TEXT ""
+#endif
+	printf("Example use, typical options:\n");
+	printf("  -d <driver> --scan\n");
+	printf("  -d <driver> { --samples N | --frames N | --time T | --continuous }\n");
+	printf("  { -d <driver> | -I <format> | -O <format> %s} --show\n", SHOW_DECODER_TEXT);
+	printf("  See the manpage or the wiki for more details.\n");
+	printf("  Note: --samples/--frames/--time/--continuous is required for acquisition.\n");
 }